LyX Ticket Tracker wrote: > #4832: missing converter dialog gives no information about originating format > > Comment: > > this does not look like the cause. can you give us some recipe how to > reproduce your problem? > I think perhaps the case where this arose could have been be from documents embedding non-default media types, for example "dia" files or graphviz "dot" files/references. In this case, it looks like the dialog doesn't know what the *input* format is, let alone how to convert it. But couldn't it instead be possible to say "while converting source file "xxxxx.dia", unable to convert from unknown input format to output format .png"...
Since I reported this bug you have switched to Trac so I'm just going to reply by email.
